Dave VanHorn nous apporta ses lumieres en ce 2007/07/04 22:32:
>  I'm a little stuck with this..
>  I'm trying to define a realistic plastic hemisphere.
> 
>  In other words, define a sphere with actual wall thickness, so that when I
> clip it with a plane, or cylinder (as drilling a hole in it) the edges show
> up, and it dosen't end up as two infinitely thin shells.
> 
> What CSG should I use for this?
> 
> 
> 
Don't clip!
Make your sphere out of 2 differenced concentric spheres. Then, use that in a 
difference or intersection with your plane, or difference it with a cylinder.
Sample:
#declare ShellSphere = difference{sphere{0,5} sphere{0,4.5}}//sphere with outer 
radius of 5 and a thickness of 0.5
With a hole in it:
difference{
	object{ShellSphere}
	cylinder{x+y*2-z, (x+y)*5, 2}
	texture{YourTexture}
	}

-- 
Alain
-------------------------------------------------
Rebellion against tyrants is obedience to God.
Benjamin Franklin

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